There's a market rotation afoot.

Jim Cramer noted that it's getting vicious out there. However, a challenging market doesn't mean it's time to cut and run.

"I think this big rally in these lower multiple stocks and the selloff in higher multiple stocks is going to [create] come opportunities to be able to scale out of some of these lower multiples that have been not so great," Cramer said.

Case in point: Merck (MRK - Get Report)

Find out why Cramer is looking at the stock in the video above.

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